This article examines the role of red deer antler ‘masks’ recovered from the Early Mesolithic site of Star Carr in northern England. It explores the agency of animals and the type of agency attributable to objects made from parts of animals at the site. When humans use or wear objects that are made from animal parts, I argue that there are also important implications for the way in which the human body is conceived. This article goes on to explore the types of body produced from the taking on of objects made from animal remains and the implications that this has for the ways both humans and animals were perceived during the Mesolithic.